Anesthetizer.



G. CLARKE.

ANESTHETIZER.

APPLICATION FILED DEO.14,1911, 1,093,975. Patented Apr. 21, 1914,

2 SHEETS-SHEET 1.

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@XW M G. CLARKE.

ANESTHETIZER.

APPLICATION FILED DEO.14, 1911.

1,093,975. Patented Apr. 21, 191 1 2 SHEETS-SHEET 2.

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'WITED STATES rarest: ora ion.

GRAHAM CLARKE, 0F CLEVELAND, OHIO, ASSIGNOR TO THE OHIO CHEMIGAL do MANUFACTURING COMPANY, OF CLEVELAND, .OHIO, A GOBPORAIION 01E OHIO.

ANESTHETIZER.

To all whom it may concern:

Be it known that I, GRAHAM CLARKE, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Anesthetizers, of which the following is a full, clear, and exact description.

This invention is an improved apparatus for administering a gaseous anesthetic, such as nitrous oxid, or oxygen, or a variable mixture of both. The apparatuses which have heretofore been employed for this purpose have required for their successful use the constant watchful care of a skilful attendant. It is essential that the pressure at the delivcry mouthpiece shall remain substantially uniform. The attendant, in charge of apparatuses which have heretofore been used, has determined variation in pressure by the feel and appearance of the flexible gas bags to which the mouth piece of the tube is attached. As the pressure in that ha appears to vary the attendant has been 0 liged to turn in the opening or closing direction, as appears to him necessary, several. valves which are between the gas supply tank and said flexible bearing.

The object of the present invention is .to

provide an apparatus by which certainty will be substituted for skilled guessing, and which will require very little attention from or manipulation by an attendant, who need. not be skilful, to obtain the desired result.

lThe invention consists in the combination' of parts shown in the drawing, and herein-f after described and claimed.

In the drawing, Figure 1 is a front view of the apparatuspartly broken away. Fig. 2 is a plan view thereof. Fig. 3 is a vertical section through the only valve mechanism in the apparatus requiring any attention from the operator while the apparatus is in use. Fig. 4c is a horizontal sectional view of said valve mechanism.

A frame B is fixed to a standard A,said

' frame having one arm which extends rear- Specification of Letters Patent.

Application filed December 14, 1911.

Fatented 231., illel.

Serial No. 665,637.

versely across itgand a port 5 which con nects the port 7) with the gas pressure reducer O. A pipe F connects the gas pres sure reducer C with the gas pressure regulater 1). One of these arms is associated with the anesthetizing gas, as nitrous oxid, and the other with the oxygen. The source of anesthetizing gas under pressure is connected with the port 6 of the front arm, for example. This gas maybe in two tanks E,

i E, which are respectively connected with the opposite ends of the ports 32 I If preferred, however, only one of these tanks may he used, in. which event, the other end oi the port 11 would have to be closed by some suit-- able means; or, instead of taking the gas from a small tank which as shown is fixed to and supported by this arm, it may be taken from a large tank located at a distant point,

'in'which event said tank could be connected with one end of the port 6 by a flexible pipe. Similarly, two oxygen tanks G, G,are con-- nected with the port Z) in the rear arm, and are suspended. from said arm. Two pipes K, K receive the gas from the two automatic gas pressure regulatorsl), D, and de .5

liver it, at diametrically opposite points, into the casing J of the only valve in the apps ratus which requires manipulation by the attendant while the ap aratus is in use. To each of these pipes 1?, K between the gas pressure regulator and the valve. casing referred to a flexible rubber bag H is connect- -ed which bag will always contain an ade 'quate supply of gas to be drawn from for administration to the patient. The tanks oi? oxygen, whether large or small, and the tanks of the nitrous oxid, whether large or small, are usually charged under a pressure of 800 pounds, more or less.

The gas pressure reducers G employed a which may occur, or be desired in practice.

absolute, but they represent the variations Thereare on sale 'nowscveral varietiesoit gas pressure reducers, suitable for use as a part of this appa 'atus, and therefore no description of them is necessary here.

An automatic gas pressure regulator suitable for use as a part of this apparatus is shown in Fig. 1.. The gas from pipe F is admitted through port d into a chamber having a horizontal flexible diaphragm 61* for its upper wall. The valve (Z for the port (I is carried by a lever (i which is operatively connected with another lever (Z and this latter lever is connected with the diaphragm d5 lVhen the gas within the chamber of this regulator increases above a determined maximum, this diaphragm is bent, and thereby, through the described levers, the valve is moved toward its seat. A spring (1 bears on said diaphragm; and the tension of the spring is regulated by the screw cap cl. By manipulating this cap this regulator may be so adjusted that the gas delivered therefrom may have any desired pressure.

Attention is now directed to t-lrvalve casing J, and the valve therein. A "tated, the two gas pressure regulators I) discharge into this casing at diametrically opposite points through the pipes K, K. The discharge pipe M, to which may be attached the flexible tube with its mouth piece or nose piece for delivering the gas to the patient, is connected with this valve casing midway between the two pipes K and K. The valve N within this casing is a tubular cylinder whose stem 72, passes out through a removable cap j, the upper surface ofwhich is graduated so as to serve as a dial j, and the pointer n is attached to this stem. Two pins j j fixed to this dial by engaging the pointer limit the movement of the valve. This valve contains three ports n n n so placed that the valve may be turned to admit nitrous oxid only from pipe K to the delivery pipe M; or to admit oxygen only from pipe K to the delivery pipe M, or to deliver any required mixture of those two gases to the delivery pipe. The dial j may he graduated so as 'to indicate the required position of the pointer to get any of the results desired.

When this apparatus is to be used, the gas regulator D is adjusted in accordance with the desired pressure. hen the mouth piece employed may cover the nose and mouth of the patient, it should be regulated to deliver at a pressure of about four ounces, if nitrous oxid is the anesthetic. If the anesthetic has to be administered through the nose only, as for throat and mouth operations, the pressure should be greater'and the regulator should be adjusted accordingly. But when this adjustment has been effected, the attendant has only to open valve N to give a full flow of the anesthetic, or turn it to get any desired mixture thereof with oxygen, or to geta full flow of oxygen; as

during the progress of the operation may be required.

Having described my invention, I claim:

1. In an anesthetizer, the combination of a gas conduit adapted for connection with a source of gas supply, a gas pressure reducer, and an automatic gas pressure regulator con. neeted in series and forming a part of said gas conduit, and a manually controlled valve in said gas conduit between the gas pressure regulator and the final outlet of said conduit, capable in'one position of entirely cutting off the escape of said 2. In an anesthetizer, the combination of a conduit adapted for connection with a source of gas supply, a gas pressure reducer,

and an automatic gasmressure regulator connected in series and forming a part of said gas conduit, a manually controlled valve in said gas conduit between the gas pressure regulator and the final outlet oi said conduit capable in one position of e11- tirely cutting oil the escape of said gas, and

a gas bag connected with the gas conduit between the gas pressure regulator and said valve.

In an anesthetizcr, the combination of two gas conduits adapted respectively for connectionwith independent sources of gas supply, a gas pressure reducer and an automatic gas pressure regulator connected in series forming a part of each gas conduit a valve casing which is connected with the elivery end of each gas conduit, and has a discharge port, and a manually controlled three way valve adapted to connect either or both gas conduits with said gas discharge port capable in one position of entirely cutting oii' the escape of said gases.

4. In an'anesthetizer, the combination of two gas conduits adapted respectively for connection with independent sources of gas supply, a gas pressure reducer and an automatic gas pressure regulator connected in series forming a part of each gas conduit, a valve casing which is connected with the delivery end of eachgas conduit, and has a discharge port and a manually controlled three-way valve adapted to connect either or both gas conduits with said gas discharge port and capable in one position of entirely cutting oil the escape of said gases, a graduated dial, and a pointer fixed to said valve and moving in juxtaposition to said dial.

5. In an anesthetizer, the combination of thereto and containing a gas port, one end of which may be connected with a source of gas, a gas pressure regulator connected with said gas port and secured'to and supported by said frame, an automatic gas regulator also secured to and supported by said fran a pipe connecting the gas pressure reduce and the gas pressure regulator, an outl pipe connected with the gas pressure regu- 120 a base having a standard, a frame fixed lator, and a manually controllefclu alve in said outlet pipe capable in one position of entirely cutting off the escape of said ga 6. In an anesthetizer the combination 0 a base having a standard a frame fixed thereto and having arms which project on opposite sides of said standard, each arm containing; a gas port which is adapted to "have one end connected with a source of gas supply, a gas pressure regulator secured to each arm of said frame and connected with the gas port therein, an automatic gas pressure regulator also supported by each arm of said frame, a pipe connecting the gas pressure reducer with the gas pressure regulater, two pipes connected respectively with the two gas pressure regulators, a valve casing with which both of said pipes are connected, said casing having a gas discharge port, and a manually controlled three-Way u valve in said casin adapted to connecteither or both of said pipesywith said outlet port and capable in one position of entirely cutting off the escape of said gases.

In testimony whereof, I hereunto aflix my signature in the presence of two witnesses. GRAHAM CLARKE. Witnesses:

H. R. SULLIVAN, E. L. TI-IURSTON. 

